Rocker arm mechanism and engine assembly
AssigneeWeichai Power Co., Ltd.
InventorsShenggang Guo, Fei Wang, Cheng Xu
Life of this patent
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Abstract
A rocker arm mechanism includes a rocker arm shaft, a rocker arm, a valve clearance adjuster, a valve train, and a control valve. The rocker arm is rotatably disposed on the rocker arm shaft. The valve train includes a valve bridge. The rocker arm is provided with a plunger chamber. The valve clearance adjuster includes a hydraulic tappet slidably disposed in the plunger chamber. The plunger chamber is supplied with oil through an oil supply passage. The control valve is configured to open or close the oil supply passage. When the control valve opens the oil supply passage, the hydraulic tappet can abut against the valve bridge and eliminate the clearance between the valve bridge and the hydraulic tappet.
Claims18
A rocker arm mechanism for an engine, the rocker arm mechanism comprising:
- a valve train including a valve bridge;
- and
- a rocker arm pivotally disposed on a rocker arm shaft, the rocker arm including:
- a plunger chamber;
- a valve clearance adjuster including a hydraulic tappet slidably disposed in the plunger chamber;
- an oil supply passage configured to supply oil to the plunger chamber;
- and
- a hydraulically actuated control valve configured to alternately open and close the oil supply passage,
- wherein the oil supplied to the plunger chamber extends the hydraulic tappet out of the rocker arm so as to abut against the valve bridge when the control valve opens the oil supply passage,
- wherein a position of the hydraulic tappet relative to the rocker arm remains unchanged when oil from a pilot signal oil passage drives the control valve so as to close the oil supply passage, and
- wherein the control valve closes the oil supply passage during an engine braking operation of the engine.
Dependencies are inferred from the claim text.